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Member postings for Dickw

Here is a list of all the postings Dickw has made in our forums. Click on a thread name to jump to the thread.

Thread: New batteries - cheap junk?
23/11/2020 10:46:27
Posted by Ian Whittaker on 23/11/2020 09:18:00:........................

The batteries are marketed at 60C

Im unsure of the current, .......................................................

Edited By Ian Whittaker on 23/11/2020 09:21:55

Your first post quoted a throttle heavy flight of 4.25 minutes requiring a 3500mAh recharge. That suggests an average current of about 50amps. Hardly an onerous task for a 60C 4500!

Dick

Thread: Balsa Cores for Turbine Blades
21/11/2020 15:29:22
Posted by Gary Manuel on 21/11/2020 13:54:42:

balsa.jpg

Depicts a typical wind turbine blade with all of its interior components broken down into different layers and materials. Balsa wood or polymer foam are the core materials for both the shear web and the shell of the blade. The shell itself is composed of resin, fiber laminate, a balsa wood core, and structural adhesive.

Edited By Gary Manuel on 21/11/2020 14:07:37

Looks like a typical moulded model wing. Been flying models made like that for many years with usually either Rohacell or balsa cores - not made by me I hasten to add!

Dick

Thread: A Shortage Of Balsa And Lipo's, Where Do We Go From Here?
18/11/2020 12:22:11

Lithium from Cornwall? It does have a better climate than most of the UK, so perhaps we could grow Balsa there as well smiley

They will be agitating for independence soon.

Dick

Thread: BMFA kick backs/discounts for clubs
17/11/2020 09:46:07
Posted by Steve J on 17/11/2020 07:12:43:

Society of Model Aircraft Engineers

Correct link this time, but for the sake of accuracy:-

Society of Model Aircraft Aeronautical Engineers

Dick

16/11/2020 21:53:14
Posted by MattyB on 16/11/2020 19:13:30:............................

Perhaps as you are here now Martin you can tell us why the BMFA feel the need to password protect the documents for the AGM when the accounts will be publicly accessible at Companies House anyway? OK the annual report from the Officers and the budget is not a statutory requirement, ...................

Edited By MattyB on 16/11/2020 19:18:38

That link is not to the BMFA's accounts - it is the wrong SMAE.

On the Companies House website you will need to search on the full name not just the initials.

Dick

16/11/2020 14:59:37
Posted by MattyB on 16/11/2020 12:17:32:
Posted by Cuban8 on 16/11/2020 12:09:42:

The article PDF is on the East Anglia region website, I imagine all BMFA regions will be carrying it.

**LINK**

Key extracts...

EDIT - I have just noticed that the membership numbers above do not match the ones in the budget report; not sure why that is...

".....................................................

Edited By MattyB on 16/11/2020 12:28:16

I don't actually know the answer, but possibly something to do with the accounts being for a March > April financial year, but the membership figures from the AGM are usuall the latest current data.

Dick

16/11/2020 11:57:40
Posted by Steve J on 16/11/2020 11:34:32:
Posted by Dickw on 16/11/2020 10:42:57:

The latest news from the AGM is here.

That is just the fees. Anybody know if anything interesting was said that isn't in the documents published before the AGM?

I don't recall anything in particular, but it was only a very short (1 hour) formal meeting.

Dick

16/11/2020 10:42:57
Posted by Capt Kremen on 16/11/2020 10:24:14:

C8 do you have a link please? Tried searching the BMFA site and all I get is AGM motor info !!!!

If you scroll down the AGM motor adverts you will eventuall come to the 2020 AGM link.

The latest news from the AGM is here.

Dick

Thread: Minijet weight
15/11/2020 12:31:33

The TN website says 623gm for the Gnat, and mine came in at 679gm complete with 4s 2200 Lipo, twin elevator servos, and telemetry sensors. It flies fine at that weight, but does have the more powerful 4s setup. Definitely needed to do a lot of sanding and not be too enthusiastic when applying paint/finish on these small models.

Dick

Edited By Dickw on 15/11/2020 12:47:38

Thread: Lone flying during Lockdown
09/11/2020 11:09:04

Latest BMFA update and advice today.

Dick

Thread: Litespan and alternative coverings
08/11/2020 10:15:18

Have a read down the list of covering materials available from Free Flight Supplies. There might be something there that you could use - e.g. the Polyester tissue.

Dick

Thread: Overspec ESC
03/11/2020 17:55:58

A linear BEC reduces the voltage via resistance (i.e. heat) and the higher the voltage input the more heat, so a linear BEC is not a good idea over 3s.

A switch mode BEC, often referred to as a UBEC, use a diferent method to reduce the voltage and is no problem over 3s.

Dick

Thread: Flying through covid !
02/11/2020 19:22:44

BMFA statement.

Thread: Help
01/11/2020 15:18:14

I am not familiar with that model so can't help directly, but have a look at this website "build" as i think it might be your model.

if that doesn't help, you can always come back here and we will do our best.

Dick

Beaten to it by a previous post - my typing is getting slow!

Edited By Dickw on 01/11/2020 15:19:20

Thread: Traditional thermal / electric glider kits
01/11/2020 11:55:29

How about something like this? There may be others suitable on the Hyperflight website, and you always get good servise from them.

Dick

Thread: Aeronaut Prop Replacement
31/10/2020 11:09:13

Sounds like a combination of "marketing" and "health and safety" self protection for the manufacturer.

I have never replaced my Aeronaut props unless they were obviously damaged, and agree they are good props.

Dick

Thread: General Purpose Servo
29/10/2020 19:34:43
Posted by Nigel R on 29/10/2020 14:30:06:

I've had a few 9g (ish) MG servos fail in flight on a 1lb 3d foamie, and my flying skills won't threaten Deano any time soon.

My suspicion is that many ARTF servo specs are a bit light, in order to fit a small light servo to get the advertised flying weight down.

YMMV, obviously.

I suspect it's more about getting the price down rather than the weight. I use 9gm servos on 1.6Kg (3.5 lb) 180mph gliders without problem, but those servos do cost a bit more than many 9gm servos.

Dick

29/10/2020 10:33:25
Posted by Ace on 29/10/2020 09:59:40:

Correct me if I am wrong but all torque figures quoted are at just 1cm from the center spline. Increase that to 2cm and it halves the torque available, increase again to 4cm and it halves again. So a 3kg at 1cm = 1.5kg at 2cm and at 4cm just 750g

to be completely accurate, and as Frank said earlier, torques is a rotational force at the servo shaft and doesn't change with distance. What does change is the linear force it produces at the end of the servo arm. Torque is specified as force times distance (e.g. kg.cm) so as the distance increases the linear force (push/pull) available will decrease, but the torque remains the same.

As you say, the linear force for any length of servo arm can be calculated from the torque figure but don't forget the effective length of the servo arm will change as the servo rotates.

Dick

Thread: Drone Delivery
28/10/2020 11:25:08
Posted by Martin_K on 28/10/2020 10:57:57:

Interesting. I know the RC car guys use sensored motors, so possibly that is part of the method to stop (and then hold) the rotors in flight at a specific position.

Edited By Martin_K on 28/10/2020 10:59:44

Interesting video!

Some of the first brushless motors and ESCs were "sensored" back in the early 1990s (see the Kontronik combination in the attached photo), but the idea was dropped when it was realised we could do everything we wanted (on aircraft) without the sensors,

Looks like soemone has now found a use for the technology, so perhaps we will see it bocome popular again.

Dick

early motors.jpg

Thread: Phone bracket for DX8
26/10/2020 12:10:05

Peter

Just checked on my phone and when I select Flight Mode ("Airplane Mode" on my phone) it does indeed turn off Bluetooth and WiFi, but I can turn those back on again and use them without turning on the cellular network again. However, the GPS course flying I have done using a friend's setup involved a usb connection between the phone and the GPS telemetry system, so not a problem either way.

Back to the OP - the GPS system flyers seem to have their Tx "Phone mounts" individually made using 3D printing, so it might be worth searching GPS flying, or even look on the multirotor forums as they sometimes do something similar.

Dick

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